1210211000221 has 4 divisors (see below), whose sum is σ = 1210364841952. Its totient is φ = 1210057158492.

The previous prime is 1210211000203. The next prime is 1210211000237. The reversal of 1210211000221 is 1220001120121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1210211000221 - 2²⁷ = 1210076782493 is a prime.

It is a super-2 number, since 2×1210211000221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210211010221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76909065 + ... + 76924798.

It is an arithmetic number, because the mean of its divisors is an integer number (302591210488).

Almost surely, 2^{1210211000221} is an apocalyptic number.

It is an amenable number.

1210211000221 is a deficient number, since it is larger than the sum of its proper divisors (153841731).

1210211000221 is an equidigital number, since it uses as much as digits as its factorization.

1210211000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153841730.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1210211000221 its reverse (1220001120121), we get a palindrome (2430212120342).

The spelling of 1210211000221 in words is "one trillion, two hundred ten billion, two hundred eleven million, two hundred twenty-one", and thus it is an aban number.